Spray head



April 1, 1930. 1

G, A. MUEITLER SPRAY HEAD Filed Ap'ril 21, 1927 www . gwwnkoz W/www g v@mr/7M Patented Apr. 1,1930

UNITED STATES PATENT oFFicE y GODFBEY A. IUELLEB, OF POINT PLACE, OHIO,ASSIGNOR T THE DE VILBISS COM-A Pmr 0F TOLEDO, OHIO, A CORPORATION OFOHIO SPRAY HEAD Application led April 21,

This invention relates to spraying equipment, and particularly to sray-headsfor airbrushes or spray-guns use for spraying surface coatingmaterials.

It is common to provide such spray-heads with supplemental air dischargepassages to effect a flattening of the main material laden air streamdischarging from the spra -head so that a fan-shaped instead of a rounspray 1o stream is produced. In these spray-heads the supplemental airjets age directed m converging planes which intersect m the axial lineof discharge of the spray stream so that as they impinge the oppositesides of said stream a flattenin thereof is effected.

It is found desirable in practice to vary. the force of discharge of thesupplemental air jets against the main stream, so that the stream may bebroadened a greater or less extent thereby. This has been accomplishedby'controlling the pressure of air discharge from the supplemental jets.o g

The object of the present invention 1s to control the force of dischargeof the supplemental flattening air against the main stream by rovidingmeans whereby the inclination of tlhe supplemental air streams withrespect to the main stream may be varied so'that the point ofintersection of the former may take place at various points along themain stream axis within predetermined limits, thereby varyin accordinglythe force of impingement o the supplemental air streams agalnst the mainstream.

The invention is fully described in the following s iiication and oneembodiment thereof illustrated in the accompanying drawingsz in which, Y

Fig. 1 is a side elevation of a spra -head embodying the invention witha part roken away, and Fig. 2 is a similar enlarged fragmentary sectionthereof. y

Referring to the drawings, 1 designates the portion of a spray-gun bodyto which the spray-head is attached andwhich, with the spray-head, inthe present instance, may be considered as the spray-head unit inasmuchas it is detachable as a unit from the spraygun body proper. Theassembled connection 5 with a spray-gun body of such unit equipped topermit the engagement therewith of a; union nut 3. The forward end ofthe enlargement 2 is provided with an externally lthreaded' nippleextension 4 concentric to the v axis of said enlargement and havin abore 5 extending axially therethrough bac into the member 1 and thencelaterally through a nipple 6 adapted to be connected to a source ofsupply of the material to be sprayed.

The inner or material discharge nozzle 7 of the spray-head, in thepresent instance, is

vof substantially conical form with its small en d terminating in arestricted dicharge orifice and with its rear end seating against thenipple or forward extension 4 of the body member 1 with its bore inregister with the bore 5 of said member. 8 designates the control valvefor the discharge orifice of the nozzle 7. The nozzle 7 is held in thepresentinstance, to its seat against the member 1 by a union nut 9,which threads onto the extension 4 and has shouldered engagement with anexternal ange on the rear end of the nozzle.

The outer or air dischar e nozzle l0 of the spray-head is mounted overthe nozzle 7 with its restricted air discharge orifice 11 encircling thedischarge end of the inner nozzle and cooperating therewith to form athin annular air discharge space so that the air discharging therefromcompletely and uniformly envelops the stream of material dischargingfrom the nozzle 7 as well understood in the art.

v The nozzle 10 is conically seated on the nozzle 7 for rotary movementsthereon and the nozzles are held in assembled relation by theengagement, in the present instance, of the union nut 3 with. the innerend portion of the outer nozzle. The conical surface of the nozzle 7 ispreferably provided with a set of four equi-distantly spacedlongitudi-V` nally extending grooves 12, which when the nozzle 10 isseated on the inner nozzle, provide passages for supplying air to thedischarge orifice 11 from a supply chamber 13 in the rear end of theouter nozzle which has communication through a passage 14 with a sourceof air pressure supply.

The nozzle l0 is provided on each of opposite sides thereof with a boss15 having a chamber 16 therein which is opened at its forward side andis adapted to receive and hold a universally adjustable nipple 17forming a supplemental air discharge jet. This nipple, in the presentinstance, has an enlarged spherical inner end portion seating in theadjacent end of the chamber 16 to adapt the nipple to have limiteduniversal- `adjustment therein, and it is held to its seat in thechamber by a spring pressed pivot member 18 acting against a cap 19closing the outer or rear end of the chamber. The inner end of thenipple 17 is recessed to its center to permit the pivot 18 to engage thenipple at its center of adjustment. The nipple has a-discharge orifice20 therein in communication at its inner end through one or more lateralpassages 21 with an external circumferential recess 22 in the ballportion of the nipple. The recess 22 is in communication in any positionof adjustment of the nipple, with a supplemental passage 23 in thenozzle 10 adapted to open at its opposite end into a registering airpassage 12 ofthe head when the nozzleelO is in proper position on thenozzle 7 for that purpose. The supplemental air discharge jets 17 areinclined with respect to the head axis so that the streams dischargedtherefrom converge and meet at some point along the axial line ofdischarge of the material laden stream from the head. By a tilting ofthe nipples 17 lio lengthwise of the head the point of meeting of theconverging supplemental air streams may be shifted toward or 4away fromthe main discharge orifices, as indicated by the dotted lines in Fig. l,so that the main stream may be flattened a greater or less extent by thesupplemental jets, depending on the distance the point of meeting of thesupplemental jets is from the spray-head. The passages 23 may be closedto the source of air pressure sip'ply by turning the nozzle 10 on thenozz e It is sometimes desirable to laterally adjust the nipples 17 sothat instead of the supplemental air streams striking the main stream'in directly opposed relation, they will strike the main stream inlaterally offset relation, thereby varying the plane of Hattening of themain stream and the extent of flattening. 4'This adjustment is permittedby reason of the universal mountings of the nipples.

I wish it understood that my invention is not limited to any specificconstruction, arrangement or form of the parts, as it is capable ofnumerous modifications and changes without departing from the spirit ofthe,

claims.

Having thus described my invention, what I claim as new and desire tosecureby Letters Patent is:

1. A spray-head having provision for the discharge of a spraying streamVtherefrom, and nipples for directing supplemental fluid streams inconverging relation against the main stream, said nipples beingangularly adjustable to vary the angles of convergence.

2. A spray-head having provision for the discharge of a spraying streamtherefrom, oppositely disposed air jet discharging members incommunication with a source of air pressure supply and adjustable withrelation to each other to direct air streams in impinging flatteningrelation against the main stream at various points lengthwise andtransversely thereof.

3. A spray-head having provision for the discharge of a spraying streamtherefrom, and a pair of oppositely disposed fluid discharge nipples incommunication with a source of fluid pressure supply and adapted todirect their discharge against opposite sides of the spraying stream toflatten the same, said members being tiltingly adjustable lengthwise ofthe spraying stream to vary the position of impingment of their fluidstreams against the spraying stream.

4. A spray-head having supplemental air discharge passages, and meansassociated with the outer end of each passage and universally adjustableto direct the air discharge therefrom in various positions along theaxis ilf ischarge of the main stream from the l 5. A spray-head havingconcentric main discharge orifices for y the material to be sprayed anda motive agent, and also having supplemental motive agent dischargepassages, and discharge nipples 'at the outer ends of said supplementalpassages adjustable with relation to each other to direct supplementalstreams of the motive agent against the main spraying stream at variouspoints lengthwise thereof.

6. In a spray-head, a pair of universally 4adjustable oppositelydisposed supplemental ment to serve as valves for controlling thsupplemental air discharge.

10. In a spray-he`ad,` a pair of oppositely disposed supplemental airjet discharging 5 members separately adjustable about trans' rverse axesto vary the angle of discharge of the supplemental air jets relative toa predetermined line.

11. In a spray-head, a pair of oppositely 1o disposed supplemental airjet discharging members, each of said members having a rockingadjustment about a transverse axis. In testimony whereof I have hereuntosigned my name to this s ecication.

-15 GODFRE A. MUELLER.

